AVO 400 Ball-bearing Turbochargers for the Legacy GT & Outback XT

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					 AVO 400 Ball-bearing Turbochargers for the Legacy GT & Outback XT




                               PN#LEG-1270-000

AVO’s line-up of ball-bearing turbocharger solutions for the USDM 2.5
Legacy GT, Spec B, and Outback XT consists of the high-response
AVO400LGT and high-power AVO450LGT. Designed specifically to
better than OEM quality, these true bolt-on solutions for the Legacy GT
and Outback XT utilize the proper oil and water cooling lines necessary
for ease of install and high reliability. Not only does the ball-bearing
design enhance response and spool times, it is more reliable than the
outdated journal-bearing design used by the OEM turbocharger.

True Ball-Bearing Turbochargers
Thanks to single-cartridge, dual ball-bearing
technology, Garrett® turbochargers
generate far less frictional drag and are 10
times more durable than traditional journal-
bearing turbochargers. New, efficient
turbine stages deliver more power to your
engine and allow ball bearing turbochargers
to spool up faster than ever and have
proven to be far more durable than journal
bearing turbochargers.

                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                          Page 1 of 7
Fax +61 3 95844008                                           Created on 9/1/06 6:03 PM
www.avoturbo.com
Journal Bearings vs. Ball Bearings
For a long time, journal bearings have been the standard technology used within a
turbocharger, dating from when turbochargers were mainly used in diesel trucks. In
the last few decades, turbochargers are being used with increasing frequency
within passenger cars, which operate over a longer rpm range and use smaller
petrol motors. To address the needs of the modern automobile, ball-bearing
cartridges were designed to improve turbocharger response. Expensive at first, it is
now an affordable technology advancement that provides significant performance
improvements to the turbocharger.




The ball bearing cartridge design is a single sleeve system that contains a set of
angular contact ball bearings on either end, whereas the traditional bearing system
contains a set of journal bearings and a thrust bearing.

Journal Bearings                                Ball Bearings




                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                          Page 2 of 7
Fax +61 3 95844008                                           Created on 9/1/06 6:03 PM
www.avoturbo.com
Turbo Response
When driving a vehicle with the cartridge ball bearing turbocharger, you will find
exceptionally crisp and strong throttle response. Ball Bearing turbochargers spool
up 15% faster than traditional journal bearings. This produces an improved
response that can be converted to quicker 0-60 mph speed. In fact, some
AVO customers report after fitting the AVO Kit said that they feel like they are
driving a big, normally aspirated engine thanks to the incredible increase in
response and the linear delivery of power.




Reduced Oil Flow
The ball bearing design reduces the required amount of oil required to provide
adequate lubrication. This lower oil volume reduces the chance for seal leakage.
Also, the ball bearing is more tolerant of marginal lube conditions, and diminishes
the possibility of turbocharger failure on engine shut down.


Improved Rotor dynamics and Durability
Ball-bearing cartridges offer much better damping and control over shaft motion,
allowing enhanced reliability for both everyday and extreme driving conditions. In
addition, the opposed angular contact bearing cartridge eliminates the need for the
thrust bearing - commonly a weak link in the turbo bearing system.




                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                           Page 3 of 7
Fax +61 3 95844008                                            Created on 9/1/06 6:03 PM
www.avoturbo.com
Water cooling
Following a hot shutdown of a turbocharger, heat soak begins. This means that the
heat in the head, exhaust manifold, and turbine housing finds it way to the center
housing of the turbo, raising its temperature. Extreme temperatures in the center
housing can result in oil coking.




To minimize the effects of heat soak-back, AVO only uses water-cooled turbo
center housings. These use coolant from the engine to act as a heat sink after
engine shutdown, preventing the oil from coking. The water lines utilize a thermal
siphon effect to reduce the peak heat soak-back temperature after key-off. The
layout of the pipes should minimize peaks and troughs with the (cool) water inlet on
the low side.

Wastegates & Turbo housings
The AVO 400 LGT turbo uses ap internal wastegate design that is built into the
turbine housing and consist of a “flapper” valve, crank arm, rod end, and pneumatic
actuator. The AVO turbine housing is designed for maximum flow with an internally
wastegated housing, as we run the
largest wastegate swing valve
possible to reduce chances of
boost creep in high horse power
engines. The quality of the AVO
turbine housing is far above the
rest with thousands of hours
invested into R&D to insure our
turbo housing performance. We
only use the highest quality, high-
temperature casting, which are
machined on a 5-axis CNC
machine to insure we maintain the
precise tolerances necessary
for maximum performance and
reliability.




                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                          Page 4 of 7
Fax +61 3 95844008                                           Created on 9/1/06 6:03 PM
www.avoturbo.com
Turbine A/R - What is A/R? A/R is Air/Ratio, the internal area size of a
turbocharger housing or compressor.

Turbine performance is greatly affected by the A/R of the housing, as it is used to
adjust the flow capacity of the turbine. Using a smaller A/R will increase the
exhaust gas velocity into the turbine wheel. This provides increased turbine power
at lower engine speeds, resulting in a quicker boost rise. However, a small A/R
also causes the flow to enter the wheel more tangentially, which reduces the
ultimate flow capacity of the turbine wheel. This will tend to increase exhaust
backpressure and hence reduce the engine's ability to "breathe" effectively at high
RPM, adversely affecting peak engine power.

Conversely, using a larger A/R will lower exhaust gas velocity, and delay boost rise.
The flow in a larger A/R housing enters the wheel in a more radial fashion,
increasing the wheel's effective flow capacity, resulting in lower backpressure and
better power at higher engine speeds.

When deciding between A/R options, be realistic with the intended vehicle use and
use the A/R to bias the performance toward the desired powerband characteristic.
The AVO 400 LGT Turbine housing, the AVO 4/5 housing, is specifically designed
for optimum performance with the Legacy GT 2.5.

Turbo Compressor Map 400LGT




Compressor Covers
AVO Compressor covers have been specially designed for maximum flow and
                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                           Page 5 of 7
Fax +61 3 95844008                                            Created on 9/1/06 6:03 PM
www.avoturbo.com
response. In our quest for maximum performance and reliability, we only use the
highest quality castings and finish off our covers with 5-axis CNC machining to
maintain the precision necessary for a high performance



Compressor A/R
While compressor performance is not as
sensitive to changes in A/R, they do still
have some influence on performance. We
have made sure to created the best size for
optimal performance




Actuator
An AVO boost actuator gives the AVO turbo
with a more controlled boost response while
ensuring boost is maintained at a preset PSI
level, resulting in increased torque and hp.
The AVO actuator delivers constant boost all
the way to redline and beyond. As an
extremely safe, reliable and effective means
of raising your boost level. AVO LGT 400
turbo boost actuators come with a minimum
spring pressures of 15 psi and are adjustable
for higher PSI levels.

Fittings
AVO only uses the highest quality fittings with our ball-bearing turbochargers,
as we are serious about reliability under the harshest of conditions.




Performance


                      AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                           Page 6 of 7
Fax +61 3 95844008                                            Created on 9/1/06 6:03 PM
www.avoturbo.com
This dyno chart demonstrates the incredible flexibility off the AVO 400
turbocharger when fitted to a Legacy 2.5 with a minimum of supporting upgrades.
With an 3” exhaust system, intake enhancements, ECU, and the AVO TMIC for the
Legacy GT, it spools up quickly and easily reached 300whp on pump gas at 18psi.




Testing

AVO believes in testing their turbochargers under all possible conditions that our customers
may use them in, from the street to the circuit. From the engine dyno to endurance racing,
we don’t leave anything to chance.




                        AVOTurboworld – For All Your Turbo Needs
Tel +61 3 95844699                                                                Page 7 of 7
Fax +61 3 95844008                                                 Created on 9/1/06 6:03 PM
www.avoturbo.com

				
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